Hypsochromic Shift /blue shift & Bathochromic Shift /red shift



Hypsochromic Shift /blue shift & Bathochromic Shift /red shift

(1)   If the group is more polar in the ground state than in the excited state, the non- bonding electrons in the ground state are relatively stabilized by hydrogen bonding or due to electrostatic interaction with the polar solvent. As result, the absorption is shifted to shorter wavelength with increasing solvent polarity. This is commonly called Hypsochromic Shift or blue shift.

(2)   On the other hand, if a group is more polar in the excited state, the non­ bonding electrons in the excited state are relatively stabilized by interaction with a polar solvent. Thus the absorption is shifted to longer wavelength with increasing solvent polarity. This is commonly called Bathochromic Shift or red shift.

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